Phonons in slow motion: Dispersion relations in ultrathin Si membranes

J. Cuffe, E. Chavez, Andrey Shchepetov, P.-O. Chapuis, E.H. El Boudouti, F. Alzina, T. Kehoe, J. Gomis-Bresco, D. Dudek, Y. Pennec, B. Djafari-Rouhani, Mika Prunnila, Jouni Ahopelto, C.M. Sotomayor Torres (Corresponding Author)

    Research output: Contribution to journalArticleScientificpeer-review

    66 Citations (Scopus)

    Abstract

    We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.
    Original languageEnglish
    Pages (from-to)3569-3573
    Number of pages4
    JournalNano Letters
    Volume12
    Issue number7
    DOIs
    Publication statusPublished - 2012
    MoE publication typeA1 Journal article-refereed

    Fingerprint

    NEMS
    Phonons
    microelectromechanical systems
    MEMS
    phonons
    membranes
    Membranes
    mechanical devices
    Acoustic variables control
    hypersonics
    Hypersonic aerodynamics
    Silicon
    phase velocity
    group velocity
    Nanostructures
    Acoustics
    acoustics
    silicon

    Keywords

    • Confined phonons
    • dispersion relations
    • inelastic light scattering
    • Si membranes
    • slow phonons
    • ultrathin

    Cite this

    Cuffe, J., Chavez, E., Shchepetov, A., Chapuis, P-O., El Boudouti, E. H., Alzina, F., ... Sotomayor Torres, C. M. (2012). Phonons in slow motion: Dispersion relations in ultrathin Si membranes. Nano Letters, 12(7), 3569-3573. https://doi.org/10.1021/nl301204u
    Cuffe, J. ; Chavez, E. ; Shchepetov, Andrey ; Chapuis, P.-O. ; El Boudouti, E.H. ; Alzina, F. ; Kehoe, T. ; Gomis-Bresco, J. ; Dudek, D. ; Pennec, Y. ; Djafari-Rouhani, B. ; Prunnila, Mika ; Ahopelto, Jouni ; Sotomayor Torres, C.M. / Phonons in slow motion : Dispersion relations in ultrathin Si membranes. In: Nano Letters. 2012 ; Vol. 12, No. 7. pp. 3569-3573.
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    title = "Phonons in slow motion: Dispersion relations in ultrathin Si membranes",
    abstract = "We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.",
    keywords = "Confined phonons, dispersion relations, inelastic light scattering, Si membranes, slow phonons, ultrathin",
    author = "J. Cuffe and E. Chavez and Andrey Shchepetov and P.-O. Chapuis and {El Boudouti}, E.H. and F. Alzina and T. Kehoe and J. Gomis-Bresco and D. Dudek and Y. Pennec and B. Djafari-Rouhani and Mika Prunnila and Jouni Ahopelto and {Sotomayor Torres}, C.M.",
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    Cuffe, J, Chavez, E, Shchepetov, A, Chapuis, P-O, El Boudouti, EH, Alzina, F, Kehoe, T, Gomis-Bresco, J, Dudek, D, Pennec, Y, Djafari-Rouhani, B, Prunnila, M, Ahopelto, J & Sotomayor Torres, CM 2012, 'Phonons in slow motion: Dispersion relations in ultrathin Si membranes', Nano Letters, vol. 12, no. 7, pp. 3569-3573. https://doi.org/10.1021/nl301204u

    Phonons in slow motion : Dispersion relations in ultrathin Si membranes. / Cuffe, J.; Chavez, E.; Shchepetov, Andrey; Chapuis, P.-O.; El Boudouti, E.H.; Alzina, F.; Kehoe, T.; Gomis-Bresco, J.; Dudek, D.; Pennec, Y.; Djafari-Rouhani, B.; Prunnila, Mika; Ahopelto, Jouni; Sotomayor Torres, C.M. (Corresponding Author).

    In: Nano Letters, Vol. 12, No. 7, 2012, p. 3569-3573.

    Research output: Contribution to journalArticleScientificpeer-review

    TY - JOUR

    T1 - Phonons in slow motion

    T2 - Dispersion relations in ultrathin Si membranes

    AU - Cuffe, J.

    AU - Chavez, E.

    AU - Shchepetov, Andrey

    AU - Chapuis, P.-O.

    AU - El Boudouti, E.H.

    AU - Alzina, F.

    AU - Kehoe, T.

    AU - Gomis-Bresco, J.

    AU - Dudek, D.

    AU - Pennec, Y.

    AU - Djafari-Rouhani, B.

    AU - Prunnila, Mika

    AU - Ahopelto, Jouni

    AU - Sotomayor Torres, C.M.

    PY - 2012

    Y1 - 2012

    N2 - We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.

    AB - We report the changes in dispersion relations of hypersonic acoustic phonons in free-standing silicon membranes as thin as ∼8 nm. We observe a reduction of the phase and group velocities of the fundamental flexural mode by more than 1 order of magnitude compared to bulk values. The modification of the dispersion relation in nanostructures has important consequences for noise control in nano- and microelectromechanical systems (MEMS/NEMS) as well as opto-mechanical devices.

    KW - Confined phonons

    KW - dispersion relations

    KW - inelastic light scattering

    KW - Si membranes

    KW - slow phonons

    KW - ultrathin

    U2 - 10.1021/nl301204u

    DO - 10.1021/nl301204u

    M3 - Article

    VL - 12

    SP - 3569

    EP - 3573

    JO - Nano Letters

    JF - Nano Letters

    SN - 1530-6984

    IS - 7

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    Cuffe J, Chavez E, Shchepetov A, Chapuis P-O, El Boudouti EH, Alzina F et al. Phonons in slow motion: Dispersion relations in ultrathin Si membranes. Nano Letters. 2012;12(7):3569-3573. https://doi.org/10.1021/nl301204u